Surface-finishing implement



J. F. KRA. SURFACE FINISHING IMPLEMENT.

APPLICATIQN FILED N0.V9, 1921.

6 SHEETS-'SHEET 2 Patented Sept. 26, 1922` 8 e O n, 8 4. L

J. F. KRALL. SURFACE FINISHING IMPLEMENT.

APPLICATION FILED NOV-9, 1921.

2. n 7mm, mm Z .Em 6% z d 6 n m Ib ,w a. P ,W a z z J. F. KRALL.

SURFACE FINISHING IMPLEMENT. APPLICATION HLED Nowa, 1921.

Patented Sep't. 26, 1922.

6 SHEETS-SHEET 4.

J. F. KRAL.

SURFACE FINISHING IMPLE'ME'NT.

APPucAnoN man Nov.9. 1921.

1,430,387. Patented Spt. 26, 1922.

6 SHEETS-SHEET 5.

J. F. KRALL. SURFACE FINISH ING IMPLEMENT.

APPLICATION FILED NOV'Q, 1921.

PatentedSept. 26, 1922.

8 sHEETFsHEET a.

w w 7 o f w a a 2 z Patented Sept. 26, 1922.

UETED STATES JOSEPH F. KRALL, OF CHICAGO, ILLINOIS.

SURFACE-FINISHING IMPLEMENT.

Application filed November 9, 1921. Serial No. 513,997.

To all whom t may Gomera:

Be it known that I, JosEPH F. KRALL, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful mprovements in Surface-Finishing mplements, of which the following is a specification, reference being had to the accompanying drawings and to the reference characters marked thereon, which form a part of this specification.

This invention relates to surface finishing implements and its principal object is to provide a portable implement for use in finishing or surfacing walls, moulding, trim and other objects which are immovable or permanently fastened in place.

Another object is to provide a portable implement embracing a tool carrying head, and supporting and guiding means therefor, capable of supportingv and guiding the tool carrying` head to move in Vertical and horizontal directions, whereby the tool may operate on the surfaoes of stationary objects along planes running vertically and horizontally.

Another object is to provide a toolcarrying head having means whereby the tool may be held in position to operate on the underside of stationary objects.

Another object is to provide a' portable support and a tool carrying head, having co-operating means whereby the tool carrying head may be readilyadjusted on the object to be operated upon. Another object is to provide motor driven actuating mechanism for the tool capable of actuating the tool in any of its various positions of adjustment.

Other objects and advantages will appear in the course of the following specification, and with all of said objects and advantages in view, this invention consists in a portable tool support, and a tool carrying head guided thereon to move in straight lines, and having adjustinent means whereby its tool may be made effective to operate in planes running vertically or horizontally. The invention further consists lin a surfacing implement embracing a carriage having power operated, tool actuating mechanism; power operated, propelling mechanism, and a travelling tool-carrying head having a tool, actuated by said tool Operating mechanism, the head being propelled by said propelling mechanism of` the carriage. It further consists in a traveling, tool-carrying head and power operated tool, capable of Operating along Vertical and horizontal planes. It further consists in the several novel featuresof construction and arrangenient and in the several vcombinations of parts hereafter described and set forth in the claims appended hereto. v

An operative form of machine embodying my invention is clearly illustrated in the accompanying drawings.

In said drawings Fig. 1 is a side elevation of a surface finishing implement, embodying a simple form,y of the present invention, showing the tool-carrying head in position foi` Operating along Vertical lines.

Fig. 2 is a rear elevation thereof, looking in the direction of the arrow 2 in Fig. 1.

'Fig 3 is a Vdetail plan view of certain frame members, the parts thereabove being cut away on the line 3-3 of Fig. 2.

Fig. 4 is a plan of certain frame adjusting mechanism.

Fig. la is a detail Vertical cross-.section taken through the adjustment screw bra'cket and arm as indicated by the arrows lf--flza of Fig. 4.

Fig. 5 is a detail view illustrating the driving mechanism, the view being partly in. plan and partly in horizontal sectlon, taken on line 5-5 of Fig. 1.

Fig. 6 is a detail, Vertical cross-section taken in line 6-6 of Figs. 1 and 5.

Fig 7 is a side elevation of a fragment of the carriage and tool carrying head, illustrating its application when Operating on the undersurface of an object, the object being illustrated in Vertical section.

Fig. 8 is a side elevation of the parts seen in Fig. y7, but showing the applicatlon of the head when Operating in Vertical planes but, along horizontal lines.

Fig. 9 is a detail rear elevatlon of the tool carrying head and a` fragment of the carriage7 looking` in the direction of the arrow 9 in Fig. 1. i

Fig. 10 is a'detailV horizontal sectlon taken on line l0-10 of Fig. 9. t

Fig. 11 is a. perspective view of a certam bolt or latch mechanism employed` for attaching the head to the guide bars.

Fig. llzl is a detail cross-section thereof, taken on line llfl-lla of Fig. 10.

Fig. 11b is a detail cross-section taken on line 11b-11b of Fig. 11a.

Fig. 12 is a detail, vertical, cross-section taken on line 12-12 of Fig. 9.

Fig. 13 is a perspective view of fragments of the tool carrying head actuating elements and the tool carrying head support.

Fig. 14 is a perspective view of the tool carrying head.

Fig. 15 is a view partly in side elevation and partly in vertical longitudinal section of the tool carrying head and a fragment of the carriage illustrating the head in position for Operating along` horizontal lines.

Fig. 16 is a rear view of the parts seen in Fig. 15, looking in the direction of the arrow 16 in Fig. 15.

Fig. 17 is a detail horizontal section taken on line 17-17 of Fig. 15.

Fig. 18 is a detail plan of a latch and clutch rod used in the device.

Fig. 19 is a fragmental side elevation of a certain frame and a platform member of the carriage.

Fig. 20 is a view partly in plan and partly in horizontal section of the tool carrying head and carriage, illustrating` the head in a position occupied when Operating on the underside of objects, the line of section being taken at 20-20 in Fig. 21.

Fig. 21 is a view partly in side elevation and partly in Vertical section taken on line 21-21 in Fig. 20.

Referring to that embodimentof my invention, illustrated in the drawings, the reference Character 25 designates a carriage as a whole, comprising the frame work for the tool carrying head. The carriage contains the driving mechanism that operates the tool carrying head and tool carried thereby.

The framework of said carriage comprises a platform 26, which is mounted on wheels or rollers 27 whereby the entire device may be readily propelled along the floor or other surface upon which supported. Upright frame members 28, are secured to and extend up from said platform, and form the guide members for the tool ca-rrying head 29. These upright frame members 28 are preferably, movab'ly connected to the platform 20 by hinges 30 (see Fig. 19), the hinge connection being at the rear of the platform and on a horizontal line, whereby the upright frame members may be more conveniently tilted forwards and backwards on said hinges when setting the device in position for operation, as will appear later. The lower' ends of the frame members 28 are connected to the forward, upper end of the platform, by strong springs 31. Tf desired, turnbuckles 32 may be employed for connecting the Springs to the platform, whereby the tensionl on the Springs may be increased or decreased. Said Springs 31 act to yieldingly -press the upright frame members towards the work. When not in use, the upright frame members are tilted forward slio'htly under the influence of the spring and this tension is maintained on the upright frame members while in use, as will be explained hereinafter.

The upper and lower ends of the frame members 28 are connected by cross-bars 33, 34, to provide a rigid frame structure, and the frame `members 28 are thereby held in parallel relationship, whereby they may act as guide bars for guiding the traveling toolcar-rying head which is movable up and down the frame members 28.

Power operated means are employed for moving it along said frame members and also for actuating the tool which is carried by the head. This actuating mechanism will now be described.

Journalled in bearings mounted on the frame member or brackets 34 of the platform 26. are two vertically extending shafts 35, 36, (see Figs. 5 and 6) the shaft 35 being` connected to and driven from a motor 37, as for instance, by a chain or belt 33 trained around a sprocket wheel 39 on the motor shaft and a sprocket wheel 40 on the shaft 35. The shafts 35, 36, are geared together, as for instance by a sprocket chain 41 trained around sproc'ket wheels 42, 43; the sprocket 42 being fast on the shaft 35 and the sprocket' 43 being` loose on the shaft 36, whereby the shaft 36 may remain idle, if desired, while the shaft 35 is in motion. Any suitable clutch mechanism may be employed between the sprocket wheel 43 and shaft 36, and for this purpose 1' have shown a slid'ing clutch collar 44 which is splined. to the shaft 36 and is provided with clutch teeth that co-operate with the clutch teeth on the hub of the sprocket wheel 43. `When the collar 44 and the sprocket 43 are united by these complemental clutch teeth, the sprocket 43 and the shaft 36 rotate together. A clutch actuating arm 45 engages in an annular groove in the clutch collar 44, and has a stem 46 on its outer end, which. is guided in a bracket 47 carried by the platform 26. A spring' 48, herein shown as interposed between the bracket .4.7 and a heady or knob 49 on the top of the stem 46, acts to unclutch the clutch collar 44 from the sprocket wheel 43. They are clutched together by depressing the stem 46. A latch plate 50 (see Fig. 18) may be provided for holding the stem 46 and associated parts in depressed condition, said latch being' here shown as pivotally secured on the platform in position to be swung over into engagement with the top of the knob 49 when the latter is depressed.

Journalled in bearing brackets 51, 5/2` located atthe top and bottom of the frame members 28, are two upright power transmitting members 53, 54, which receive their motion from the shafts 35, 36, respectively, as for instance, through the instrumentality of intermeshing spur gearwheels 55, 56, fast on the lower ends of the members 53, and shaft 35, and intermeshing spur gear wheels 57, 58, fast on the lower ends of the member '54 and the shaft 36. The member 53 acts to transmit motion to the 'tool and the member 54 acts to raise and lower the tool'carrying head, as will be presently described.

The tool carrying head 29 (see F igs. 9 to 14, inclusive) is preferably in the form of a box like structure, and has means for supporting and guiding a tool 59 therein, and contains mechanism for transmitting motion from the member 53 to said tool 59. Means are also provided for connecting the head with the member 54, whereby said head may be fed or moved along the upright frame members 28.

Referring to Fig. 13, a tool head support or bracket 60 will be seen, which conveniently may be in the form of a horizontal bar or plate, having bosses or collars 61, 62, secured to it, which bosses encircle the members 53, 54. The boss 61 is loosely fitted on the member 53, and slides freely thereon, whereas the boss 62 is internally threaded, and threadedly engages with threads 63 on the member 54. As a result of this connection, when the screw threaded member 54 is rotated, the support 60 is raised or lowered, depending upon the direction in which the member 54 is rotated. VVhen the head 29 is connected with said support 60, it is moved with said support. For convenience the head 29 is i'emovably secured to the support 60 by bolt or screws 64 which extend through the walls of the head and through the support.l I prefer to provide a second support 60a, similar to the support 60 for connection to the top of the tool carrying head 29. The entire head 29 may be readily detached from the supports 60. by loosening the bolts 64.

The head is guided upon the upright frame members to move in a vertical direction, and said frame members 28 may be conveniently constructed in a form designed to act as guide bars, and with guideways 65 for this purpose. The guideways may be provided by forming the frame members 28 of channel like formation, with the channels facing each other. One of the flanges 66 of each guide bar is made wider than the other one 67, as is clearly illustrated in Fig. 10. The head 29 fits between the opposing edges of the narrow flanges 67 and when secured in place on theguide bars in a position to operate in a vertical direction, the rear face 68 of the head 29 bears against the inner faces of the flanges 66. Oppositely disposed shoes or lugs 69 project from the sides 70 of the head and enter the channels in the guide bars and engage with the inner faces of the flanges 67. This forms a convenient means for slidably connecting the head with'the guide bars, and for maintaining the head in alinement with the guide bars during its travel from one end thereof to the other. 5

Means are provided whereby the shoes or lugs 69 may be retracted to disengage them from the guide bars,l and in the simple means shown for accomplishing this, the shoes or lugs are slidably mounted in slots formed in the sides 70 of the head, and are spring pressed in an outward direction 'by springs 71, which are placed behind thev rear or inner edges of the shoes. the shoes and springs areinclosed by and guided in 'casings or housings 72 that are secured on the inner faces of the sides 70. The springs 71 act to hold the shoes in position engaging the flanges 67 of the guide bars, and the shoes may be formed with Shoulders or ribs 74 at their inner edges, which latter are adapted to engage the inner face of the sides 70 of the head to limit their outward movement, when not confined by the guide bars.

Simple means are provided for retracting the shoes and for holding them in retracted position, said means may, for nstance, comprise a stem 73 secured to theshoe and extending out through a wall of the casing, the stem having a swiveled connection with the shoe. This connection may be formed by a pin 73a (see Fig.V 11a) seated in an annular groove in the stem 73. The stem has an outsta-nding lug 73'D which may pass into and out of lthe casing 72 through a slot 73c (see Fg. 11h). By drawing back the 'stem 73 until the lug 73b passes through the slot 73c and turning the stem on its axis to bring the lug out of line with the slot 730, the lug will engage the wall 'of the casing when the stem is released, and the shoe will thereby be held in a vretracted position. If desired, two suchstems may be provided for each shoe, as is 'clearly shown in Fig. 11. Vhen assembling the head withthe guide bars, the shoes are drawn inward against the tension of the springs, and the head inserted between the 'guide bars. When the shoes have passed the narrow flanges 67, the springs 71, will a'ct to force them outward behindv said flanges, thereby looking the head on the gudebars. The' head may .then be secured to` the supporting bars 60,

The tool usedv with this device may take any form desired, for planing, scraping'or Cutting 'into the' surface of the work operated on. It is here shown in the'A form of a blade 75, suitably secured to atool holder 76 'which is' guided in th'e'head 29;' The Preferably,

'o i inaoa'z blade is adjustably held in the holder 76 by any suit-able blade holding mechanism, whereby it may be adjusted to make a deep or shallow cut, as is desired. Conveniently, the guiding means for the holder may comprise grooved guide bars 77 secured on the opposing inner faces of the sides 70 of the head, in which; groov'es the ends of the holder 76 travel.

The Cutting tool is reciprocated in the operation of the device. The mechanism for reciprocating the tool, as shown, comprises a crank shaft 78, journalled in the head 27, and having a Crank arm 79 therein which is connected to the tool 59 by a link or connecting` rod 80, one end of the link being connected to the outer end of the crank arm and the ot-her end being connected to the tool by ears or lugs 81. n the simple form of mechanism herein shown, the crank shaft 78 is bent to form a double crank arm (see Fig. 10) and the link 80 connects with the outer bent end of the crank arm. The crank shaft 78 is held in place in the head by two collars 7 8a, which are removably secured to the shaft 78 and which bear against the inner faces of the sides 70 of the head. The sha-ft may be readily removed from the head by loosening the collars 7 8a.

Removably secured upon the crank shaft 78 is a spiral gear wheel. 82 which is arranged to mesh with spiral teeth 83 that are formed upon the driving member 53, said spiral teeth eXtend from the top to the bottom of the member 53 whereby the spiral gear wheel 82 and spirally toothed driving member 53 may intermesh at any place along the length of said member.

Itv is quite obvious from the above description, that when the motor 37 is set in motion, the spirally toothed driving member 53 is rotated thereby, and that a reciproca'ting mot-ion is imparted to the tool 59 through the instrumentality of the spirally toothed gear wheel 82, the crank shat't 78 and link or connecting` rod 80. It will also be understood that when the Clutch collar 44 is clutched with the sprocket wheel 43, the screw threaded drive member 63 will be thereby rotated, and that the tool carrying head 29` will be fed or moved along the guide bars 28.

The tool carrying head and its connections with the guide bars have now been described with reference to the work to be performed along Vertical planes, as for instance, on the upright members of door casings, window casings'.v or other Vertical trim or mouldings that lie parallel with the face of the wall. But vmy invention is equally applicable to other uses. For instance, I have shown in the drawings means whereby the tool Carrying head 29 may be connected to the guide bars in position to operate on objects which extend in horizontal lines, such as Chair rails, base boards, picture mouldings, the outer horizontal members of door casings and so forth.

To enable the tool carrying head to be supported in position to operate along horizontal lines, the head is provided with opposing shoes 69a (see Figs. 15 and 16), similar in construction to the ones heretofore described, said shoes 69a being located on the sides 83 of the head. Said shoes 69aco-act with the guide bars 28 to guide the head to move in a Vertical direction, but when the tool carrying head is used to operate along horizontal lines, the threaded drive member 54 is held stationary during the operation of the tool and the tool is thereby maintained in horizontal alignment. When cutting Vertical sui'faces, it will be understood that the axis of the spiral gear 82 is at right angles to the aXis of the. driving` member 58, but when Cutting horizontal surfaces the aXes of the gear 82 and the member 53 are parallel. I-lence, when using the tool for Cutting along horizontal lines, the spiral gear wheel 82 is replaced by a spiral gear wheel 82a, which has spiral teeth that mesh with the teeth of the spiral toothed member 53, when the axes of the latter and the spiral gear wheel are parallel. The head is bolted to the supports 60, 60a, as before, and the spiral gear wheel 82a and spiral toothed driving member 53 are intermeshed, whereby power may be transmitted, from the motor to the tool, the reciprocations of the tool, however, being along` horizontal lines in this case. l/Vhen Operating along horizontal lines, the entire device is bodily moved along` the floor or surface upon which it is supported.

Tn addition to Operating upon Vertical surfaces and upon surfaces that extend in horizontal lines but in Vertical planes, the cutter head may also be arranged to operate along horizontal planes, as for instance on the undersides of door and window casings, and so forth. To enable the head to be connected to the guide bars for Operations on the underside of horizontal surfaces, the head is provided with shoes or lugs 84 located on the opposite sides 83 of the head, but running' parallel with the sides 70 4(see Figs. 14, 20 and 21). rlfhe shoes or lugs 84: are constructed substantially like the shoes 69, although the form shown, they are considerably shorter. VVhen the shoes or lugs 84: are engaged with the guide bars 28, the side of the head carrying the tool 59 is brought uppermost, the tool at this time lying in and reciprocating in a horizontal plane, as is also illustrated in Fig. 7. When used in this position the spiral gear wheel 82 is out of mesh with the spiral toothed driving member 53 and other gears are interposed between the crank shaft 78 and driving member 53, which, for convenience,

'may comprise a pinion 85 on the Crank shaft 78, a gear wheel 86 meshing therewith, and a spiral gear wheel 87 connected with the pinion 86 and meshing with the spirally toothed, driving member 53. These gear wheels and pinions may accompany the device, and when required, the pinion 85 may be secured on an end of the crank shaft 78, and the gear Wheels 86, 87, may be secured on a stud shaft 88, which may be fastened to the side of the head.

It is quite obvious from the above explanation, that the rotary movement of the spirally toothed, driving `member 53 is translated into the reciprocating movements of the tool 59 through the connection described, and that the reciprocating movements of the tool are in a horizontal plane. In using the head in this position, the screw threaded driving member 54 is held stationary and the entire device is moved bodily along the floor or other surface o which the device is supported.

At the top of the frame members 28 is an adjustment member (see `Figs. 1,2, 3, 4 and 4a) for properly locating the frame member and tool with respect to the work or surface to be operated on. Said adjustment member comprises a roller or wheel 90 which is arranged to bear lagainst the work or adjacent surface, and an adjustably mounted support therefor. The roller or wheel 90 is arranged in a horizontal plane whereby it may roll along the surface, against which it bears, when the entire structure is moved parallel with said surface. In the form shown, the roller or wheel 90 is journalled in a bracket 91, which is provided with two horizontally extending arms 92, which are secured on the ends of two parallel rods 93, that extend through a cross bar 94 which is secured to an upstanding lug 95 of the frame bracket or brace 33.' Confined between nuts 96 on the outer ends of the rods 93, and the bar 94, are coled compression springs 97 which act to draw the roller orwheel 90, and parts carryi'ng it, towards the lug 95. `An. adjustment screw 98 threaded in said lug 95 and bearing against the bracket 91 .(see "Fig. 4a.) opposes the action of the springsg97 and furnishes means for moving the'roller' or wheel away from theframemembers.yy

In operation, when used Yfor operating upon upright'objects, the device ,is .placed adjacent to said object, and `by adju'sting the platform and the upper end of the upright frame members, the latterjmay be properly spaced away from the work. Before any additional pressure'is. applied to the top of the platform, the latter occupies a slightly, downwardly-inclined position, as indicated in Fig. 19, when the platform 26 is standing on a horizontal surface and the frame members 28 are Vertical.V lBy applying weight to the platform, as for instance when the attendant stands on the same l(asV he generally does while performing work with the implement), the platform is' brought down on its lfour supporting wheels and` the tension of the springs 31 is then applied to force the upper end of the frame members 28 toward the work.l The adjustment mechanism at the top of the frame members holds the latter in spaced relation to the work, and is manipulated, by the turning of the adjustment screw 98, to properly locate the upper end of the frame members `with respect thereto. The motor being started and, assuming that the clutch for the drive member 54 is in engagement,the tool carrying head is nowl slowly moved in an upward direction and the Cutting tool is reciprocated thereby, thus planing, scraping or cutting'the work as the case may be, depending on the kind of tool employed.

To operate along horizontal lines, the tool carrying head is detached from the carriage, the substitute spiral gear wheel 82a substituted` and the tool carrying head replaced on the carriage, but at right anglesto the position above described. The threaded drive member 54 isthen rotated to bring the tool. to the proper height and position to do its work and the motor started. The clutch in this case should be Vunclutched so that the position of the tool carrying head may remain constant. When cutting alon a horizontal line, the device is propelle along the work by hand.

The under surface of the objects may be operated on by properly placing the head on the carriage and adding the pinion and gear wheels 85, 86, 87, as `has been heretofore set forth. c

lOne of the particular advantages of this implement is its capability of being moved to the work, and set up in operative relation thereto. It is especially useful in refinishing permanently located, or immovable 110 objects, such as door and windowcasings, chair rails, base boards, picture moldings and so forth, which have been installed in place. With this implement the surface of objects may be re-cut to give them a more 115 attractive appearance, and difierent design, by using a blade having a Cutting edge of the desired design, or the surfaces may be scraped.v orA planed to provide a finished appearance. 120

It will be obvious to those skilled in the art, that modifications and changes may be made in the device, without changing the principle of my invention and that my invention is not to be limited to any specific 125 form or detail excepting as set forth in the claims appended hereto.

I claim as new and desire Letters Patent:

to secure by 1,. A surface` finishing implement comprising a portable carriage, upright guide bars hingedly seoured thereto, a tool carrying head movably mounted on said guide bars, a reciprocatory tool mounted in said head, means for raising and lowering said toolcarryinghead, and means for operating the tool.

2. A surface finishing implement comprising a portable carriage, upright guide bars hingedly secured thereto, means for pressing said bars in a lateral directi'on, a tool carrying` head movably mounted on said guide bars, a tool mounted in said head, means for reciprocating the tool, and means foi` raising and lowering said tool carrying head.

3. A surface finishing implement comprising a portable carriage, upright guide bars hingedly secured thereto, means for pressing said bars in a lateral direction, a tool carrying head removably mounted on said guide bars, slidable connections between said head and said guide bars, la rec'iprocating tool insaid head, means for actuating the tool, and means for raising and lowering'the tool carrying head.

z A surface finishing implement, comprising a portable carriage comprising a platform, upright frame members hingedly secured to said platform, and ineansf for pressing said frame members in a lateral direction, a tool carrying head slidably mounted on said upright frame members, a reciprocating tool mounted in said head means for Operating said tool, and means for raising and lowering said head.

5. A surface inishing implement, compris'ing a portable carriage comprising a platform, upright frame members, hingedly secured to said platform, and tension Springs connecting said upright frame members With said platform, and acting to press said frame members in a lateral direction, a tool carrying head slidably mounted on said upright frame members, a tool mounted in said head, and means for raising and lowering said head.

6. A surface finishing implement, comprising a portable carriage comprising a platform, upright frame members, hingedly secured to said platform, means for pressing said frame members in a lateral direction, id frame adjusting mechanism at the upper end of said frame members, a tool carrying head slidably mounted on said upright frame members, a tool mounted in said head, and means for raising and loWering said head.

7. A surface finishing implement, comprising a portable carriage comprising a platform, upri'ht frame members, hingedly secured to said platform, and means for pressing said :frame members in a lateral di rection, there being frame adjusting mechanism at the upper end of said frame mem- Leeds-38a bers embracing a work engaging roller, a tool carrying head slidably mounted on said upright frame members, a tool mounted in said head, and means for raising and lowering said head.

8. In a surface inishing implement, a pair of guide bars, a tool carrying head, a tool mounted therein, oppositely disposed, spring pressed retractable shoes adjustably mounted in said head and co-operating` With said guide bars to slidably and removably connect said head With said guide bars, and means for raising and lowering` the head.

9. ln a surface finishing implement, a pair of guide bars, a tool carrying head, a tool mounted therein, oppositely disposed, spring pressed retractable shoes adjustably mounted in said head and co-operating With said guide bars to slidably and removably connect said head With said guide bars, and means for securing said shoes in retracted position, and means for raising` and lowering the head.

10. In a surface finishing implement, a pair of guide bars, a traveling toolv carrying head and tool mounted therein, a plurality of guide shoe members associated With said head, said guide shoe members being arranged in different angularly disposed planes to co-operate With said guide bars, Whereby said head may be mounted on saidv guide bars in different angularly disposed planes.

ll. In a surface finishing implement, a portable carriage, a pair of Vertically disposed guide bars hingedly connected thereto, a traveling tool carrying head, a tool mounted therein, and means on said head cooperating with said guide bars for detachably connecting said head With said guide bars in position to operate the tool When in either a Vertical or horiziontal plane.

12. In a surface finishing implement, a pair of guidebars, a feed screw andv a spiral 'toothed driving member rotatively supported adjacent said bars, a traveling tool car ing head and a tool mounted therein, heaiiy supporting means co-operating With said feed screw to propel said head along said bars, operative connection between said tool and spiral toothed driving member, including a spiral gear wheel, and shoes mounted on said head for detachably connecting said head With said bars, there being a plurality of sets of shoes arranged in planes disposed at different angles to one another, Whereby the head may be connected to said bars in position to operate in a plurality of angularly disposed planes.

13. In a surface finishing implement, the combination, with a carriage having'- upright guide members, ofa feed screw, and a spiral toothed driving member journaled on said guide members, power driven means for rotating said feed sorew and spiral toothed member, a traveling tool oarrying head guided upon said frame members, head supporting means seoured to said head, and oooperating with said feed screw to propel said head along said frame members, a tool mounted in said head, and tool Operating connections, embracing a spiral gear wheel, meshing with said spiral toothed driving member.

14. In a surface finishing implement, the combination with a carriage having upright guide members, of a feed screw, and a spiral toothed driving member journalled on said guide members, power driven means for rotating said feed sorew and spiral toothed member, olutoh mechanism nterposed in said driven means for the feed screw, a traveling tool oarrying head guided upon said frame members, head supporting means secured to said head, and co-operating with said feed screw to propel said head along said frame members, a tool mounted in said head, and tool Operating oonnections, embraeing a spiral gear wheel meshing with said spiral toothed driving member.

15. In a surface finishing implement, a combination with a oarriage having upright guide members, of a feed screw, and a spiral toothed driving member journalled on said guide members, power driven means for rotating said feed sorew and spiral toothed member, a traveling tool carrying head guded upon said frame members, head supporting means seeured to said head, and cooperating with said feed screw to propel said head along said frame members, a reoiprocatory tool mounted in said head, and tool Operating connections, embraoing tool reoiprocating meehanism and a spiral gear wheel meshing with said spiral toothed driving member.

16. In a surface finishing implement, the

combination, with a oarriage having upright guide members, of a feed sorew, and a spiral toothed driving member journaled on said guide members, power driven means for rotating said feed sorew and spiral toothed member, a traveling tool carrying head guided upon said frame members, head supporting means seeured to said head, and eooperating with said feed sorew to propel said head along said frame members, a reeiprocatory tool mounted in saidl head, a crank shaft rotatively mounted in said head, and having a Crank thereon, a link conneoting said Crank with said tool and a spiral gear wheel removably secured on said Crank shaft and meshing with said spiral toothed driving member.

In testimony that I olaim the foregoing as my invention I affix my signature, in the presence of two witnesses, this 7th day of November, 1921.

J OSEPH F. KRALL. 

